A gunman opened fire on an outdoor country music festival in Las Vegas, killing at least 59 and injuring more than 515, according to reports, in the worst mass shooting in modern U.S. history.

Mass shooting at Mandalay Bay Hotel and Casino in Las Vegas

Las Vegas, Nevada

A body lies under a sheet as fire and rescue personnel gather at the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on Oct. 1, 2017 in Las Vegas, Nevada.